parcelle



(No Model.) 3 Sheets-Sheet 2.

A. L. 'PAROELLE.

ELECTRICAL SYNOHRONOUS MOVEMENT.

No. 324,153. Patented Aug 11,1885

ig I 4 a H n n n WITNESSES INVENTOR By 711': .Lltto are: e

(No Model.) 3 SheetsSheet 8.

A. L. PARGELLE.

' ELECTRIOAL SYNGHRONOUS MOVEMENT.

No. 324,153. 7 Patented Aug 11, 1885.

WITNESSES INVENTOR Q .11 L larcelle d By hi. .dttorneys r I I I a N. PETERS. Pnmunw m mr, Walhmglcn. o. c.

equipped according to my invention.

UNITED STATES PATENT OFFICE.

ALBERT L. PAROELLE, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE NATIONAL ELECTRICAL COMPANY, OF NEIV YORK, N. Y.

ELECTRICAL SYNCHRONOUS MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 324,153,6lated August 11, 1885.

(No model.)

To alt whom, it may concern.-

Be it known that I, ALBERT L. PAROELLE, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improved Electrical Synchronous Movement, of which the following is a specification.

Such movements are capable of various uses, and of course I contemplate employing myinvention wherever the synchronous movement of ele-etrieally-connected apparatus is desired. An important field for such an invention is that of multiplex telegraphic transmission of messages, and I have therefore, as one application of my invention, shown ordinary telegraphic keys and relays connected with insulated contacts, over which circuit-completers carried by the synchronously-moving apparatus pass. Of course any other suitable telegraphic apparatus other than those of the character shown may be used.

I am aware that numerous arrangements for obtaining synchronous movements have been heretofore patented. My invention, however, differs from all such systems, both in its general principles of operation as well as its details of Organization.

In the accompanying drawings, Figure 1,1 is a diagrammatic view illustrating two stations, X and Y, connected by a main line and Fig. 2 is a detail View, partly in section. illustrating the motor which I prefer to employ in working my system; and Figs. 3 and 4 are diagrams showing the traveling arms in varying posi tions.

In Fig. 1,1,two stations, X and Y,are shown connected by a main line. The organizations at both stations are identical, and are as follows:

A vibrator, A, mounted at one end in a block or post, A, carries an armature, a, arranged transversely on its free end and acted upon by magnets B 0, having the faces of their poles opposite the face of the armature and in a plane substantially parallel therewith. Gontacts b 0 on opposite sides of the vibrator make contact with spring-fingers I) c in the circuit of the motor-magnets B O, to make and break the circuit, as is well understood. In addition to these contacts, I also employ switch devices D, which may be constructed as follows: A sliding block, E, is mounted on a suitable bedplate, the sliding block being guided and limited in its movement by two screws, 6, which pass through slots in the block and are secured to the bed-plate. Two uprights or posts on the sliding block are provided with adj usting-screws 6, between which the vi brator A is located. As the vibrator moves, therefore, the sliding block is shifted first to one side and then to the other, and the exact moment of its movement may be regulated in a measure by the adjusting-screws 0'. These screws may be tipped with rubber or cork to prevent noise.

The sliding block carries two contact-fingers, F G, (either insulated or uninsulated from each other,) which make and break contacts with posts f g as the vibrator moves back and forth and shifts the switclrblock. One pole of the motor-battery LB is connected with the heel of the vibrator. From thence the circuit is continued through the vibrator to the platinum contacts I) c, thence by either of the springs b or a through the coils of either of the magnets B or O, and thence to either of the contact-fingers F or G and contact-post f or g to the opposite pole of the battery.

These circuits are shown in the drawings by dotted lines. The circuit of the magnet B is represented by the letter If, and that of the magnet C by the letter 0 In starting the motor into operation an impulse of vibration may be imparted to it by the hand of the operator. Assuming that the vibrator is moving toward and across the faces of the poles of the magnet O,the contact 0 will make contact with the finger 0 while the contact-finger G of the switch devices is on the contact-face of the post 9. The circuit, therefore, willbe completed from the battery L B through the vibrator, contact a, finger c, coils of the magnet O, and thence by wire 0 to the finger G, post g, and opposite pole of the battery, and the armature a will be attraeted.

continued mox ement of the vibrator in that direction opens the circuit just described by the shifting of the sliding block E, which moves the finger G out of contact with the post 9, and makes contact between the finger The 5 F and the post f in the circuit of the opposite magnet B. The yibrator will now by its resilience spring back and make contact between the contact-plate b and the finger Z), thus completing the motor-circuit through the coils of the magnet B. Under the attraction of the magnet B the vibrator continuesits movement until by the shifting of the block E the circuit of said magnet is opened at the contacts Ff.

I utilize the vibrating motor just described to actuate circuit-com 'ileting devices in the following manner, (see more especially Fig. 2:) The vibrator is there shown as rocking an anchor-lever, H, back and forth in its vibration. This lever is shown as pivoted in a horizontal arm, H, of a standard, H mounted on the bed-plate. The lower end 01'' the anchor-lever on which the vibrator acts is notched, and is preferably provided with elongated lateral extensions 71, which serve as guides orgnards to prevent the vibrator swinging free 01" the anchor-lever, and thus insure its proper actuation. Pitmen or push-andpull arms H, pivoted on the anchor-lever, carry pawls or teeth, which work in a ratchetwhecl, H", having its bearing in the standard II. The rocking of the anchor-lever by the vibrator causes, therefore, an intermittent or step-by-step rotation of the ratchet-wheel. A circular table, I, is carried by the standard ll, and is supported thereon concentrically with the axis of the ratchet-wheel H. The axle of the ratchet'wheel passes through the table, and carries on its outer end an arm, K, which extends across the table I, and is provided at one end with a traili g brush or finger, k, which traverses arour. \the table. A circular series of independei contacts are arranged upon the table in tl path of the brush In, which makes contact ."th them successively.

In Fig.1, 1,the organization above described is illustrated properly connected at the upper part of the figure at each station, while the lower part of the figure diagrammatically rep resents the table, the trailing circuit-completer, and the electrical devices and circuits of my improved synchronous arrangement.

The vibrator-motor which I hate described is one well adapted for the actuation of my synchronous movements; but I do not confine myself to its use, nor is any claim herein made to the motor per 86, as it constitutes the subject-matter of another application filed by me September 1, 1884, and numbered 14.1,952.

In electrical synchronous systems hereto fore patented it has been proposed to actuate the apparatus independently at each station and to correct the speed of the motive apparatus at one station by means of an impulse of electricity transmitted from the distant star tion. Though I employ an independentlyactuatcd motor at each station, the correction, should the apparatus at one of the stations move too fast, is accomplished locally by said apparatus itself, though the efi'ect of such correction is removed by an impulse of electricity from the distant station, and this feature constitutes one of the peculiar characteristics of my invention.

On the table I at each station I have shown four contacts devoted to maintaining the synch ronous movement of the apparatus at the two stations. Two of these contacts (marked at m) are placed one on each side of the table, though not directly opposite each other, and are connected to earth by a wire, m through the coil of a magnet, M, as clearly shown. The other two contacts, an, also arranged on opposite sides of the table, about midway between the contacts m in, though not directly opposite each other, are connected together, and by a line, a", with a main battery, NIB. The arm K, which carries the brush or circuit-completer 70, extends entirely across the table of contacts, and is shown as projecting slightly beyond the table at each end. It is so shaped that a straight line drawn from the end It" to the end which carries the trailingfinger would not be a true diameterofthe circle of the table of contacts, but the end carrying the trailing-finger is deflected from a true diameter, the direction of the dcllection being toward the end of the trailing-brush h. This is done so that in the operation of the apparatus the end of the trailingiinger will make contact at the proper time with the plates in m and a n, which are placed at irregular i11- tervals around the table, as is fully described below.

A detent, 0, lies normally in the path of the extended ends of the arm K, as clearly illustrated in the drawings. This detent preferably consists of an elastic or spring arm, which is mounted and slides in a suitable frame, I, for the purpose presently described, and carries an armature, 0, which is acted upon, as will be described, by the magnet M. The detentarm Ois constructed with a guidepin, which slides in an eye in the frame 1?, and is provided with a coiled spring, 0', which tends normally to press the arm outwardly from the frame in the direction of the magnet M. The detent 0 between the arms of the frame P is provided with an enlarged face or plate, 0", which, when the detent is thrust back by the impact of the arm K, as shown at X in Fig. 1, makes contact with two adjustable contact-pins, c and I), mounted in but insulated from the frame I. The contact-pin c" is connected by a line, 0, with the circuits 0 of the magnet G at a point between the coils of the magnet and the contact-finger G in said circuit, and by a line. b, with the circuit b of the magnet B. The pin 11" is connected by line (1, key Q, and its back stop, through the coil of the magnet M, to earth, as clearly shown in the drawings. The front stop of the key is connected, as shown, with the main battery MB. Another insulated contact-pin, 1', mounted on the leg of the frame I opposite that which carries the pin 0', is connected with the arm K, as clearly shown. When the detent O is pushed back by the end of the arm K abutting against it, as shown in the drawings, (Fig. 1, station X,) it makes contact by means of its plate with the two pins 0 and If, and when the detent is not in engagement with one of the ends of the arm K its contact-plate 0 is pressed by the spring 0 toward the opposite leg of the frame P into contact with the insulated contact-pin r, (station Y, Fig. 1,) which is connected directly with the arm K, as before mentioned. The pole of the local battery LB which is not 0011- nected with the heel of the vibrator is connected, as shown, by a line, lb, with the frame P. The main line L, connecting the stations, is also connected at each end with the frame P, and the frame is electrically connected with the detent O,which is carried byit. This construction is well adapted for the purpose and the various connections properly made; but of course my invention is not limited to such de tails. The purpose of these various connections will now be described.

When the contact-plate 0" of the detent O is in the position shown in the drawings at X, Fig. 1, one or the other of the local motor-ole cuits Z) or 0 will be completed around and outside of the switch devices D, so that that circuit which happens to be completed at the points I) b or c 0 will remain closed as long as the detent remains in the position illustrated, and the vibrator will be checked or held up toward the magnet, B or G, the'circuit of which is completed, asjust stated. For instance, if the vibrator has swung to the right, as viewed in the drawings, and makes contact between its plate a and contact-finger c, the

motor-circuit of the motor 0 will be completed as follows: from the local battery LB through the vibrator, contacts 0 c, coils of the magnet 0, line 0 0 pin 0, contact-plate 0 of the detent, frame P, and by line lb to the opposite pole of the battery; and as long as the circuit remains closed at the pin 0 the vibrator will be held on that side ofthe center of vibration and prevented from swinging back toward the magnet B. The same operation would occur if the vibrator happened to be in a position to make contact between band I), and the vibrator would be held up by the magnet B. By this means I am enabled to check or retard the speed of the vibrator to insure the synchronous movementof the apparatus, as will more fully appear presently. When the contact-plate o is pressed out (which is the normal position) by the spring so as to break contact with c and b, of course the shunts aroundthe switch device D are opened and the motor operates as before described. When the contact-plate -0 of the detent O is in contact with the mainline pin 1', which is the normal position when the apparatus at the two stations is running synchronously, the main-line circuit will be completed from one station to the other through the frame P, contact-plate 0", pin 1", and radial arm K to the contacts or space between the correcting-contacts m m and n n, and may be used for any purpose desired.

Whenever either end of the arm K has abutted against the detent O, as shown in the drawings, the end of'the trailing-finger It will be on one of the ground-contacts m m. For instance, take the position shown atXin Fig. 1. There the brush end of the arm K has abutted against the detent O, and the end of the trailing-finger k is resting on the ground-contact m. In this position the main-line circuit is completedv through the frameP, detent 0, arm K, groundcontact at, and coil of the magnet M to earth. When the opposite end of the arm is against the detent,the finger It will make contact with the other ground-contact-,m, and the circuits are the same as just mentioned. If, therefore, an impulse be received from the distant station with the arm in either of the two positions mentioned, the magnet will be energized and the detent drawn down out of the path of the pin. lVith the parts as shown at Fig. 1, station X, the vibrator, when vibrating, will be checked or held up at one side of its stroke, as before mentioned, so that all the parts at that station will be checked.

Assuming, now, that the apparatus at the two stations is running, and that the arm K at station X is a little in advance of the arm at Y, so that the end of the arm carrying the brush at X has pushed back the detent O at that station before the trailing-brush It at station Y has come upon the battery-contact 11, under these conditions one of the motor-circuits b or 0 will he completed, as before described, according to whether the vibrator is moving up or down, as viewed in the drawlugs, and has made contact with either spring b or c. The effect of such a completion is to hold up the vibrator on one side and check all the apparatus at station X to retard its motion. As the brush is at stationYcomes upon the battery-contact a,an impulse of electricity from main battery MB will be transmitted through wire a contact a, trailing-brush, arm K, pin 1', over the main line, and at station X through the frame P, pin b", wire q, key Q, and coil of magnet M, to ground. By thisimpulse, therefore, the magnet M will be energized, and,attracting the armature 0,will draw the spring-detent 0 out of the path of the end of the arm K. The spring 0 will force the contact-plate out of contact with the pins 0%, the check or brake on the motor will be removed, and it will st-artinto operation to again rotate the radial arm K. At the same time the main-line circuit is completed, as described, by the plate 0 making contact with the pin 1' at station X. \Vhen this operation oceurs,the arms at both stations will continue to move in their proper respective positionsthat is to say, the brush it at station Y will leave the battery-contact a at the moment the brush it at station X leaves the ground-contact m. If they continue to move at the same speed, by the time the brush end of the arm at station Y has reached the detent O and is about to strike it, the brush k at station X will come upon the battery-contact '21, and an impulse of electricity will be transmitted, in the manner before described, from station X to station Y to remove the detent 0 from the path of the arm K. Should the arm K at station Y move more rapidly than the arm at station X during the portion oftheir revolutionsjust described,it will strike the detent, the parts will be thrown into the same positions as indicated at X, and the motor at Y will be checked in the manner already described, and when the brush at station X comes upon the battery-contact a the detent will be thrown out of the path of the arm at station Y, so that the arms at both stations can again start together. The same operation occurs when the end 7c of the arm at X upon its further movement reaches or strikes the detent O,and the brush k at station Y comes upon the battery contact n. Thus as long as the apparatus at the two stations is running synchronously the detents 0 will be withdrawn from the paths of the traveling arms just at the proper moment, and this will occur alternately, two such impulses being sent from Y and two from X during each revolution of the arm K; but should the apparatus at one station run ahead of that at the other the end ofthe arm K would strike the detent before it had been removed by the impulse of electricity received from the distant station and the speed of the accelerated apparatus checked.

XVhen the end of the arm K strikes the detent O,the detent yields and the arm follows it for a short distance. Aside from the other results accomplished by this movement, the yielding of the detent permits the contact finger or brush kto move over part of the ground-contact m or m, and when the finger 7r at the other stat-ion first comes upon the battery-contact at that station the arm abutting against the detent will be slightly in advance of its proper position at the moment the impulse of electricity is transmitted to release it. This gives a period of time for the transmitted impulses to act, and also gives an allowance for the inertia oft-he arm at rest, so that by the time it commences to move it occupies the proper relative position to the other arm. The extent of this movement may be varied by adjusting the contactpins c b r.

During the period that the contact-fingers k at each station are traversing the circles of contacts between the ground and battery contacts the main line is completed from the brush at one station to the brush at the other station, ,and is entirely free for any purpose for which it may be desired.

As before remarked, the ground-contacts m m and the battery-contaets a n are 'not immediately opposite each other. and the table of contacts is not divided into four equal sections by these contacts. For instance, the table at station X has twenty-four contacts be tween the battery-contact n and the groundcontaet in. There are twenty-seven between the ground-contacts m and the battery-contact-11 thirty between the battery-contact a and the ground-contact m, and twenty-seven between the gronnd'eontact m and the battery-contact 72. At station Y the four sections into which the table is divided are proportioned in the same way, but they do not occupy the same relative position. There are twenty-seven contacts between a and in, thirty between at and n, twenty-seven between a and m, and twenty-four between or and n. \Vhen the arms K are moving synchronously, however, each arm has to travel over the same number of contacts to reach its respective ground or battery contact. This will. clearly appear by reference to the drawings. Of course the spaces between the battery and ground contacts need not be divided in the manner illustrated, or in any particular manner so far as my synchronous movement is concerned; nor do I limit myself to the particular irregular arrangement illustrated of the battery and ground contacts in the circle. The irregular arrangement, in connection with the deflection of the arms K, removes the de tents at irregular intervals in the circle of rotation, and therefore, though the arms K may not start in the proper relative position, they will in a few moments, by the alternating impulses, be brought into the proper relation and caused to rotate synchronously.

By arranging the contacts at irregular intervals a correction can take place ot'rener than once in a revolution. Should the arm be started and the contacts placed at regular intervals, one arm might be half a revolution ahead of the other, and still both the machines would run, because the detent would be removed at the half-revolutions; but the machines would not be synchronous. If more than one correction is to take place in a revolution, the contacts should therefore be placed at irregular intervals in the circle and the rotating arm deflected to conform to such irregularity. Again, the irregular arrangement of contacts makes the apparatus self-synchronous when they have been started into operation.

The magnet M is shown and described as located directly in the main-line circuit, and this is perhaps as good an arrangement as any on short lines. \Vhen desired, however, an ordinary line-relay may be used to work the magnet M locally.

\Vhen the apparatus is running, the impulses of electricity alternately sent from one station to the other occur periodically when the finger it comes on a battery-contact at the sending-station. Such impulses always act on the detent at the dist-ant station to either move it out of the path of the arm K before or after said arm comes in contact with it. The correcting-checks which act on the motor that is moving too rapidly are entirely local, and occur, as described, when the rotating arm K abuts against the detent O, and thus closes the shunts of the local battery around the switch D in the motor-circuits. Theoretically the rotating arms are checked or stopped to correct the speed of the motor; but practically such checks, when they do occur, occupy such a brief period of time that their effect on the apparatus cannot be detected. If, therefore, telegraph-instruments were connected at each station with a number of corresponding contacts, as is contemplated in this class of apparatus, the operators would not be aware of the correcting-checks. I have shown fifteen teeth in the ratchet-wheel H, actuated by the motor; and if the vibrator makes thirty vibrations per second, the arm K will rotate over the table of contacts twice in a seconda speed suitable to such a table of contacts, as shown. Of course any other rate of vibration and any other number of teeth in the ratchet may be adopted.

\Vhere the circle of contacts is large, or the speed of rotation rather rapid, or where the distance from one station to the other is great, of course the width of the ground and battery contacts may be increased so as to give a proper duration of ground and battery connection for the effectual transmission of the impulses.

In describing the synchronous operation of my improved apparatus I started with the assumption that the arm at each station was run ning. If the arms at the two stations were at rest, with the brushes on the ground-contacts m or m, and with the detent in the normal position indicated at Y in Fig. 1, then the operator at either station could call the operator at the other station by pushing the plate 0 of the detent back into contact with the pin I), for then a depression of the key Q at that station would transmit an impulse of electricity from the battery MB, through said pin, detent-plate, and frame F, over the main line, to the distant station,where it would pass by way of the frame P, detentplate, contact 1', to the arm K, its brush, and ground-contact,through the coil of the magnet M,to ground. The magnet being thus energized would attract the detent-armature 0 against its pole, and call the attention of the operator. In this way the operators may be called up and the apparatus started whenever desired.

In starting the apparatus the arms may start in any position in which they happen to be when the respective motors are thrown into action by the operators. They will, however, as before remarked, by the alternate corrections, be brought into proper position for synchronous operationthat is, into the position illustrated in Fig. 1. Assuming, for in stance, that the arms start in about the positions indicated by the full lines in Fig. 3, then they would travel until the ends of the arms abut against the detents, as indicated by dotted lines in Fig. 3, and stop the apparatus at both stations, as before described. Then, if the operator-say at station Yrcleases the arm and throws the motor into operation by depressing the detent, the arm at that station will commence to move in the direction of the arrow, and when it has traveled over the table to the first battery-contact, n, as shown at Y, Fig. 4, an impulse of electricity will be sent from the battery MB at station Y, through the wire a, contact a, arm K, contact-pin 1, plate 0 of the detent, and frame I, over the main line, to station X, where the current passes through the frame P, contact-plate 0", pin 1), and key Q, through the coil of the electro-magnet M, to earth. This energizes the magnet M, and the detent O at station X is drawn out of the path of the end k of the arm K, which commences to rotate from the position indicated at X, Fig. 1, at the same time that the brush is at station Y leaves the contact a. If the apparatus is running synehronouslynow, the brush it at station X will reach the battery-contact n at the same moment that the brush at stationY reaches the groundcontact m, and, as described, the detent will be removed from the path of the latter brush. If, however, the arm K at Y moves ahead of the arm at X, it will be stopped by the detent and the speed of its motor checked, as has been fully explained. No matter in what positions the arms may be started with relation to each other, the apparatus at the stations will be alternately corrected until the arms are brought into the proper positions shown in Fig. 1.

If the apparatus at the two stations is at rest, with the arms K pressing against the detents so as to force them back against the pins 0 11*, of course the operator at either station may release the arm at that station by depressing the detent, as before mentioned; but if, in addition to these conditions, the vibrators of the motors are drawn to one side, so as to close either of the shunts b c, then the operator at either station, by the depression of his key Q, may release the motor and apparatus at the distant station and start it into operation, as already described.

\Vhen either of the apparatus has been started, it will transmit its releasing impulse to the distant station to remove the detent from the path of the arm at that station, and then by the alternate corrections described the arms at both stations will be brought into proper synchronous relation.

It will be observed that the width of the ground and battery contacts, the length ofthe brush It, the deflection of the arm K, and the amount of movement of the detent are so proportioned that the brush will come upon the ground-contacts before it moves the detent back, and will still be upon the groundcontact afterthe detent has been thrust entirely back. The purpose of this arrangement is, that if the arms are running synchronously the impulse from the battery-contact at one station to the groundcontaet at the other will pass and energize the magnet M before the detent has been pushed back, so that it will be removed from the path of the arm without stopping it. This will appear clear from Figs. 1, 3, and 4.

I have indicated in the simplest diagrammatic manner at each station, merely by way of illustration, three, telegraphic keys, S, and relays T, each connected with a contact on the table of contacts. The relays are all prel'erably grounded by wire a through the coil of the magnet M. The front stops ofthe keys are con nected through a resistance, R71, by wire t,with the main battery MB. I have shown each key connected with one contact only; but of course any desired number of the independent contacts may be connected with each set of telegraphic instruments, as is now well understood by those expert in this matter. The operators at one station may telegraph to the corresponding operators at the other over the interrupted circuit which is given in rapid succession to each pair ofoperators as the arms K synchronously rotate.

The resistances Rh are introduced in the telegraph-lines for the following purpose: If the full power of the battery MB were sent into the line by the manipulation of the keys S, such telegraphic impulses would also ener gize the magnet M at the distant station, and might move the detent Oat an improper time. By introducing the resistances and making the detents O of a tension to resist the power of the magnets except when energized by the l'ull power of the batteries MB, such an action 1s prevented.

The relays T are preferably grounded, as shown, through the magnets M, so that in case the apparatus is not in proper position to re ceive the regularly-transmitted impulses sent to release the detent-as, for instance, if plate 0" of detent did not make contact with its pin Z)"the operator, by working the key Q at the distant station, may send an impulse of the full power of the battery MB through one of the telegraphic contacts and relays at the station receiving the impulse. This arrangement is not, however, deemed necessary.

It will perhaps be found best on long lines to ground the line at each end between the contacts by inserting supplementary contacts in the circle, as 'is now well understood and set forth in sundry patents.

The particular motors illustrated are, in my opinion, specially adapted to this synchronous system. They can be adjusted so that two of them can be made to run at speeds so nearly equal to each other that only occa sional corrections of the apparatus are required, and, of course, the more equality of speed the greater will be the efficiency of the apparatus.

As before remarked, this invention is not limited to the particular motor, nor to other specific details of construction and organiza tion so far as the broader principles of the invention are concerned, as electrical engineers may readily devise other apparatus to work on the same principle.

Thetable of contacts shown in the drawings is larger in proportion to the size of the motor than I prefer to construct it. The parts would be more accurately proportioned it'the vibrator of the motor were twice the length and thickness shown, and for such a sized motorIprefer to make the vibrator about an inch in width. This size is one which I have found to work well at the rate of thirty vibrations per second.

The two parts of Fig. 1 are placed on separate sheets, so as to show a large circle 01' contacts and bring out the operation more clearly.

As viewed in the drawings, Figs. 1 and 1, the contacts are preferably so located on the circular table that when it is divided into quadrants by drawing vertical and horizontal lines through its center, such lines will pass between adjacent contacts and not through any of them.

I claim as my invention 1. The combination of the main line, independently-actuated vibrators at each end of the main line, rotating apparatus at each end of the line controlled by said vibrators, local correcting devices at one end of the line for correcting the speed of the vibrator and apparatus at that station solely by their own action, and means by which a current of electricity is transmitted over the line to release or free the vibrator and apparatus from said correcting action.

2. The combination of the main line, independently-actuated vibrators at each end of the main line, rotating apparatus at each end of the main line controlled by said vibrators, local correcting devices at each station for correcting the speed of either vibrator when it runs out of time with the other solely by the action of the correcting devices at the particular station, and means by which currents of electricity may be sent from either station to the other to release the vibrators from said correcting action.

3. The combination of a main line, independently-actuated apparatus at each end of the main line, a vibrator at one end of the main line for controlling the apparatus at that station, correcting devices by which the vibrator is automatically corrected at said station solely by the action of the correcting devices at that station when the apparatus at said station runs out of time with the apparatus at the distant station, and means for transmittinga correcting impulse ot'electricity over the line to release or free the vibrator from said correction.

4. The combination of a main line, independently-rotating apparatus at each end of the line, a vibrator at one station for actuating or controlling the apparatus at that station, a local circuit for correcting the action of the vibrator, means by which the rotating apparatus at the vibratorstation completes said correcting-circuit when the apparatus runs out of time with the apparatus at the distant station, and means for transmitting an impulse of electricity over the line to release the vibrator from said correcting action when the apparatus at the two stations come into proper relative position.

5. The combination of the mainline, an independently-actuated vibrator at each end of the line, rotating apparatus controlled by said IlO vibrators, a local circuit at each station for correcting the speed of the vibrator, means at each station for completing said local circuit whenever the apparatus at either station runs out of time with that at the distant station, and means for transmitting a current of electricity over the line to release either of said apparatus when both apparatus comeinto corresponding positions.

6. The combination of a main line, atable of contacts and a rotating arm which traverses said table at each end of the main line, a detent or circuit-changer located in the path of said traveling arm at one station, with which said arm makes contact when it runs ahead of the other arm at the distant station, and electric devices for transmitting a current of electricity from the distant station to separate said arm and circuit-changer when the two apparatus come into corresponding positions, for the purpose set forth.

7. The combination of the main line, the independently-actuated apparatus at each end of the main-line, synchronously-rotatingdevices actuated by said apparatus, a detent or circuit-changer located in the path of said rotating apparatus at each station, and a local circuit at each station thrown into operation by said detent or circuit-changer to control the speed of the independentlyactuated apparatus at that station.

8. The combination of the main line, independently-actuated apparatus at each end of the main line, synchronouslyrotating devices actuated by said apparatus, a detent or circuit-changer at each station, which normally lies in the path of said rotating devices, a local circuit at each station for controlling the independently-actuated apparatus, which circuit is thrown into operation whenever the synchronously-rotating devices come in contact with said detent, and electromagnetic devices for periodically and alternately re moving the detent from the path of the rotating apparatus at each station by means of an impulse of electricity transmitted from the distant station.

9. The combination of amain line, independently-actuated apparatus at each end of the main line, synchronously-rotating devices actuated by said apparatus, the circuitcompleter ortrailing-finger at each station, normally connected with the main line, a table of contacts over which said finger traverses, a detent or circuit-changer normally located in the path of the rotating devices at each station, a local circuit at each station controlled by said circuit-changer for correcting the speed oftheindependently-actuatedapparatus, and the battery and ground contacts at each station.

10. The combination of a main line, synchronously-rotated apparatus at each end of the main line, trailingfingers or circuit-completers carried by said rotating devices, a table of contacts at each station, over which said circuit-completerstraverse, means, substantially such as described, for maintaining the synchronous rotation of said devices, and the ground and battery contacts placed at irregular intervals in the table of contacts at each station.

11 The combination of the main line,synchronously-actuated apparatus and a table of contacts at each end of the main line, rotating arms having circuit-completers which traverse said tables of contacts, actuated by said synchronously-moving apparatus, said rotating arms occupying positions when moving synchronously substantially at right angles to each other, the ground and battery contacts placed at irregular intervals in the table of contacts, and means, substantially such as described, for maintaining the synchronous movement of the apparatus at the two stations.

12. The combination of the main line, ro tating apparatus at each end of the main line, a detent in the path of the rotating apparatus at each station, and means, substantially such as described, for alternately removing said detents from the paths of the rotating apparatus, to insure their equal and uniform movement.

18. The combination of the main line, rotating apparatus at each end of the main line, a detent or circuit-changer in the path of the rotating apparatus at each station, with which either of said rotating apparatus makes c011- tact to correct its speed only when it runs ahead of the other apparatus, and means, substantially such as described, for alternately removing said detents from the paths of said rotating apparatus, substantially as set forth.

let. The combination of the main line, the rotating apparatus ateach end of the main line, a detent in the path of said rotating apparatus at each station, ground and battery contacts at each station, over which a circuitcompleter on the rotating apparatus moves, and electric circuits and devices for alternately and periodically removing said detent from the path of the rotating apparatus at each station.

15. In a synchronous system of electrical movements, substantially such as herein described, the combination of rotating circuitcompleters, a table of contacts over which said circuit-completers move, and ground and battery contacts placed at irregular intervals in said tables of contacts.

16. The combination of the main line, the indcpendently-actuated vibrator at each end of the main line, the motor-magnets, circuits, contacts, and switch devices of each vibrator, shunts around the switch devices in the circuits of the motor-magnets, the synchronously-rotating devices actuated by said vibrators, a detent or circuit-changer located in the path of said rotating devices at each station, contacts by means of which said circuitchanger or detent closes the shunts in the motor-circuits whenever the rotating devices at one of the stations comes in contact with the detent, and means, substantially such as described, whereby the detents are periodically alternately removed from the paths of the retating devices.

17. In a system of synchronous movement, substantially such as herein described, the combination of the rotating arms, the yielding deteuts, and the ground and battery contaets.

18. The combination of the main line, rotating apparatt'is at each end of the main line, a yielding detent in the path of the rotating apparatus at each station, and means, substantially such as described, for alternately removing said deteuts from the paths of the rotating apparatus.

19. In electrically-connected rotating appa ratus, the combination of the rotating arm and the yielding detent for acting on said arm, for the purpose set forth.

said rotating apparatus, and a key and battery at each station for transmitting an impulse of electricity to the distant station for removing the deteut from the path of the rotating apparatus.

In testimony whereof I have hereunto subscribed my name.

ALBERT L. PARCELLE.

Witnesses:

A. B. COFFIN, COLEMAN DIANNING. 

